Bella - Baby 1x1 Rib Long Sleeve Infant Sleeper - 125 and the soft material of 1*1 baby rib knit is 100% cotton which has been made with 30 single combed ring-spun weighing 5.8 oz., 195 gm/m and gives utmost comfort. The back sleeve flaps of the rib are best for protecting their little hands. These are available in various infant sizes such as 0/3, 3/6, 6/12 months. This product is perfect as we know a baby grows well during his/her sleep so they should be comfortable while napping.